2-tier shmoo tier
I wouldn't get too hung up on the tiers. First look at your competition, other businesses who sell to the same customers, various affiliate platforms they use, what key selling features they are using to get affiliates. Sign up for them all and see how it goes, check their TOS, commissions, and so on.
Also make sure you have a website that converts, have the data to show affiliates, are using a good web analytics system, and some other forms of marketing such as PPC, SEO, email marketing, offline ads.
You said "will be selling" so I would focus on the selling first, and then get into adding an affiliate channel later.
-Peter
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